scripts/scrolling-title.nix


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{pkgs}:
pkgs.writeShellApplication {
  name = "scrolling-title";
  runtimeInputs = with pkgs; [
    mpc
    coreutils
  ];
  text = ''
    WIDTH=20
    PADDING="        "

    RAW_STR=$(mpc current)

    if [ -z "$RAW_STR" ]; then
      echo "Stopped"
      exit 0
    fi

    STR="$RAW_STR$PADDING"
    LEN=''${#STR}

    T=$(date +%s)
    INDEX=$(( T % LEN ))

    # Output the scrolled window
    DOUBLE_STR="''$STR''$STR''$STR"
    echo "''${DOUBLE_STR:''$INDEX:''$WIDTH}"
  '';
}